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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cae7c553ceb921f449fd93e18de95b2106338d4ee42f2686deeaf8869d31ff' 
  AND token = 'r0NZZwKuWcc04xICqmynM1E4Uehyphxkm41ysWXse1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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