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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9171215efad6fb0155b88297ecfc38d3edde187e595a812fa7a17784ba54bdaf' 
  AND token = '+PBWwUiXGAnDM/CLZwWCNFLS7tMaKvk3CTA70lNle0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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