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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf81f4f84668e775e0e519f9099954f8bba51d3c0032c9970fb9591de4f89765' 
  AND token = '32P8QhjEEZCtsXLdPj55fTXdO6DiQqZUnwEKuVyH3s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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