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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde79f213c9c69b27c73f1a5014539461bf229c0b8ea7df1a0033e71c6c251ed' 
  AND token = 'dHV/EmDLGB6FQ2Kpu2fQzu5Uu91LVQI9J9/CpK6IlCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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