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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1a67da9e8a4b6d15eb99ffb509e028ab5b816a3fe540e2eb39eff0f04b80dc' 
  AND token = 'oBjiMGcNTMkmlDYbigdh1PmfrckCmBiq8Da8Ui5MArY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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