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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0b660bd989ea323421177e4d627b25b819b2acd2afd4aaa6b27658aec7c9d6' 
  AND token = 'IT2elscZ09CrMx5KyctCPrvJD3JKCVpJhd/JZ+pxun8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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