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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca04438a1a87afc1e0f4d05d5e753ec9e50016aedcc523e0e13341c73b2d5f88' 
  AND token = '/Ufn/JWShcx1+emtHylQiQ82bcSNMm92xigGNZoc7po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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