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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c60bb94a499b4ab24e4927ec91f0bfd6bc0bf925a910b5d4ca91a86d28d0605' 
  AND token = 'FAlreMbtTtT/oT4wpWkHPc/0rLREjGfBGeXTL/iRUds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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