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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fef1a1eb742b911c8247504a15ef2de52e7e3a557f870fbe62150a175dfde1' 
  AND token = 'jhFu+UIirr4egFOBjOiFGzx3o7UoVf8SoBPP1Bzw/5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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