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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b70a04619576e44e525bc57ddbc1a539323320c8c3d97507dcf8f57f7a24c3' 
  AND token = '4oc8ui6ApiAFqYqU3LTT2zdKKB/xG0rSLO+B4j+Ys34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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