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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b960fb9a8b3f25e39ee462778cd50a4631518b204273d7f2a9a7869df40c01' 
  AND token = '4ceWN2BJidaplMWFECG5b81trm/ghPfMuFYaWLLZXvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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