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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f7a13041d2676e54de6b814837a8e1ef2f89799efd1fef90e501cbe43b0afd' 
  AND token = 'SQ0rZWhmqST8V7YKMrYmngZZ2G1BlmIt3oAeYDa+L10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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