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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d84187b336a81863c289b32db2a926a823d6fb801faf98969bc3aeadd970b92' 
  AND token = '8kWqhPbf/dS/PMo/gJQWmoKDHor/muyEYScPAeC5xhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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