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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38650f3e2b53d973e5e22616233a61abd60eafe55cb933985b4bd5db6630174' 
  AND token = 'SD8XH5oMXYaEMAUiTZqZOvraHm5i2XFBxk2jiRQ8va0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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