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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9485ad0b1725cc6ef14e8c7e8115fb4274cf05cc3224cb8dd4b0b2e91adff33' 
  AND token = '4vf3NfOcOCD/BNw9/xzz9b2BTvukQ5LVVPdqSBMUy74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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