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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac943d2dfb3f4d4a69cc2a4b20329b9d72eddae217a22a0b2aa802657e6efff1' 
  AND token = 'y6H6G7Onx3GqNM1lklPxGpeMXzo+eAVyA7bKSvFdSrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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