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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4cc3b24de435cb3f17f9415dcddcaa420787cc3c030af1cdef0b607360b8cd' 
  AND token = 'WB5ULG3gxtUbXY4K07U819LXSntWCAeu0Nx/hcP4dTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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