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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbaa93657aa8126973c408580ea1e59614d64961085129f3343c6c43d87e72b' 
  AND token = 'FdAFdC5crfsQVYz/DUVqBZEsR24gep8yo7rMpOZOMmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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