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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a63dd5af1a21637b97e2c502ad1b9012d47b0639349c23152cbe5a45134ab9' 
  AND token = '1r8mN01zl0zj+qejEhf3/y54IueLM8PL8HNzhr2G9QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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