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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0908f90470ecd4e3a3873cbea1e3d0a906dacea2f3d5850db42f7c92787b09b0' 
  AND token = 'aaiWWUMlxn+sYeP5vN6bnJtqua+s8ksJ3xTamu8M7fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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