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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99721f7f73a3f0347461c072d46f22023439232581a3e77635c1167296ed6c' 
  AND token = 'pIDRMia2RIl+NeoZKjibrYpA6CpsAjNP6nt4Y4rdJyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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