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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc487fe74295bdfcc9b2a9244891f1bf5b674e22bdfb8d962cb6944daa6f9c5' 
  AND token = 'rFs6sArNy5Xzvq9+9+5N3DAAFzLhnG0pmy1zPb5phPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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