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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a739988fddd8f0144c23cb1d26561db652ead046bd4ab1dead87d9aa0bb9a01' 
  AND token = 'oSYgcFzddct7E5Nv9tGY/KzCWv1tiEeDbcEVPLdVdKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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