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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dbffc36383ecf3f64800e3e10e046f6d38c01a7685ff1f5bdfe2e0b0a32dee' 
  AND token = 'jr68FIpdcum8x5YcQNZJTd336ux0U9DXmN8NidvHhRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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