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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea086724fdc8f1bb3166e1977e2bd88dea99fd945525ba8cdf8d7e54f0ef0d2' 
  AND token = 'W6+xzibZdiZbqeDeRnbFmu2GKTriF7Jk96uAA/8XaaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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