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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e114323c94c2d8546e68960d0c0455e50f867f80761f6187a5fd76bf94fec2cf' 
  AND token = '0eB6fMWORksVuIHea6FSduF0L1U9KplepaWi5nOlrh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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