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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630b98359cd0cdabfba63e879c5ca5a545568d10bf23cf98131d767f0c8931e2' 
  AND token = 'm4B09D/CDmv4AvYE58jb8qIq2TDN5Mg5HW1niTyia14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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