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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e537b8c5bb0157cc7254af531ca0d0a29ae7a5ec24713fe61b21afc21c4b80e' 
  AND token = 'eDiHxMyJDfesZV5yL+gi+iECAmr7rhXFXIemHr0t3Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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