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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3744970217bed1ed9aaee5d8f8fc5b358303dfa913f74ee30a85fd0f877f21' 
  AND token = 'F92On5VTEQ14ebTdPbhZ4701jF3f5IDEhgkBWG+Cq24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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