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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0605409643a28ad9198c1c74c46e0d35c25c4b0fcc7b3df31ecc5f9bbc90d2' 
  AND token = 'PrNzlASkd2KFzSYPn74Ec5D/RJOAvX11LqK859X0/CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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