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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86130c4a315fa366feb7ebfc8041b099797ff4682fc955485e849f3c62a68dce' 
  AND token = 'ePcNA/1cifgm1PTSW0Ai9MNqy5yhG0pXJ7ramVUwEgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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