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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a30b4184c9509c5cf37252050a08b93d85cc41bf3e074b751e91702607ae989' 
  AND token = 'SpLsIfzcySfXbCv3fdNlEHrrVyhK4BM54CqdCWHE2ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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