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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1f5938827e47be7a7e5cf3b3298161c4626953fe059e5b84b5863e8468072b' 
  AND token = 'F4kJjx9yYIn+b4e7SWt9WbKJDPpTSzYZAU5c1/EI++I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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