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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9239c82890173693fdb9711bddcdbacc15f2fad69179afad3fa6c8111ea351' 
  AND token = '+VnoX4HiWn2HGZb3Fa2Bofg47upx4/xBi75Kj3UTElI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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