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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba80956294d6599f6b2760ee197bc6dd16e0a870b5586136560a47f9a2d1ecd6' 
  AND token = 'R+mrKKGXozNr9DwoARA+veUKnQN2pjnwi9a4OB7pqOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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