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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca8af5136adc49afa6b345244ea295536db55fae902394989302f2fbe6b9d13' 
  AND token = 'PMdl5HcU/ZfKUQkQv6d2FArBpeRez5lYXcKB+Q6c08w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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