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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd775ddab6c5fae93da80f01433b087ff6ef112f746218b53a3f4bd696460cf7e' 
  AND token = 'piniu3/km9+rTtEhxyk/uXSA7wog+gMtCk5d209sZrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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