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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a17032581409d51184a4dea4723856596d20d36d815865422379561cb5801a' 
  AND token = '+09fAvJ9R5vJ2klAyeOyMCI5utGOidVVAY1TJ0vqr/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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