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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e97b1e90c89a602381f581aef585e0b7ec102c2999d1e47245560c83c59bd64' 
  AND token = '4Z85IzAwmgiEFREbCecpf+sY0bwGyUH8vlb4LtlZtFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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