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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc46ab80711dcefca9e62ecb58e00e12215291d29e3980f32131e6f5a56b1c5e' 
  AND token = '/SSCvJxLw1Rct7XoNlyIc+2rWx1hwnA2IGMbGYdCz4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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