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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf7198bb7f063aec42ae7ee51e28570ba47468b95d35bca62b5b4d15977583a' 
  AND token = 'cusI6rIym0+i1MkLRJnG65uF4vNluqmZ93W1qI2y+Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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