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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016ba04d74fd1c09dae94adc4754f68772ff2ee41257cdad6f9d37e259c37d1a' 
  AND token = 'FmL638ZwRvq3fzC1eqOSbbzTGHk4a/BxkmLQemxR2Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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