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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28c70ec4a92d608402ea38d0ca5ea08f55ac0b69286cf41acc28c928b0dce58' 
  AND token = '/BxKc+QgRyStWCjoNk6ZXGkIyipqkIBq32SEnElhsDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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