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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74647f5927cf22624de079568ba2d7c139b553bdf7a7a5cccc223f905e35a61e' 
  AND token = '/pPBQ1qOmFvlavF21aNCxZcQH874M1HXE/pjB1GuX4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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