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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6dec643f340a3b4a1b35049c287e114000351278a31ec2c36cb69729133875' 
  AND token = 'QQ4Y7I07mbgXubw5weNYYQqnvXb8FELPiAPNWL7MhnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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