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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46532d8c4419ef738bcc7616314c3d1a99761334fb528a0309344a9570b9365' 
  AND token = 'wBn/NFCDvvEn/L73HE0E+f2588+dOHszR04IJzwpA98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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