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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5728f6b4ccd889b835c7f809af47986e914e1ff2595ff4f403c2c158909b4670' 
  AND token = 'ZYMLMpPQEfOghTfVeHt8RqFi8g3mLW3x8Ll8DIkyGZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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