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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfa1571032a2ef8807fc81639df1f768164c7b602fcf244933b32ca494e5875' 
  AND token = 'd4qjyCp7t6DP3oLx32h3SMxeJnFaNJlmW+yt7p2SSCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}