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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7015c438bd0107ffb6a1728087663f1bd94de41d6b16ac4f84c696049d54aa6c' 
  AND token = 'GRK6NoaHhcxmAU3cSImhpGonCyPTKSVSNdpuiAR8I+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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