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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55401d114649d7e20e4b3185393222458712d172d6a2c85f0f6247f9abebe03' 
  AND token = '3nPOwn2zuXgmvkY+Q2E+Sf6yED+3FC543j7Bmn65XZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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