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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6037690a7adefeaf61fcf469c3bf4e79b7adbd9d4c8a0f77163412b0ab48727' 
  AND token = 'K1Sil3u3rDvwM539c7HHpqOBjkycWvAbsyFQJ47N6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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