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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b0fcf4863a3be03f9167616655277336d32ae2b054e1e13de09a3116b505ac' 
  AND token = 'aAxEqmlL2ZFCeW+t/flVTrppyfemRwZ4Az6HhQb6YNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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